PL-300 Visualize and analyze the data Practice Question
You have a Power BI report that shows sales by region. The map visual displays regions with incorrect boundaries. What is the most likely cause?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Bing Maps geocoding inaccuracies.
The correct answer is D: Bing Maps geocoding inaccuracies. Power BI's map and filled map visuals rely on Bing Maps to geocode location data (such as region names) into geographic shapes, and ambiguous or non-standard region names can be matched to the wrong boundaries, producing incorrect shapes. This is the most likely cause of misdrawn region boundaries, since the visual itself is functioning but the geocoding lookup resolves to the wrong place. Option A is incorrect because visual choice affects suitability, not boundary accuracy. Option B is incorrect because a stale data source would show outdated values, not wrong geographic boundaries. Option C is incorrect because overlapping labels are a formatting/rendering issue, not a cause of incorrect region shapes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The map visual is not the best choice for the data.
Why it's wrong here
Choosing a different visual (e.g., bar chart, table) would alter the presentation but cannot change the geographic boundary lines rendered by the map. Boundary discrepancies are a function of the mapping service's spatial geometry, not the visual type selected in Power BI. Even if a map is a poor choice for the data, the boundary issue would persist across any map-based visual, so the root cause lies elsewhere.
- ✗
The data source is not refreshed.
Why it's wrong here
Refreshing the dataset updates the underlying numbers and metadata from the source, but Power BI does not store geographic boundary definitions in the dataset; those are fetched live from Bing Maps spatial services. If the region boundaries are misaligned, they will remain misaligned after every scheduled or manual refresh. Stale data might explain outdated sales figures, but it cannot explain why the map's borders are drawn incorrectly.
- ✗
The map labels are overlapping.
Why it's wrong here
Overlapping labels are a rendering concern where text placeholders collide on the map canvas, reducing readability, but they do not alter the underlying polygon shapes or boundary lines of the regions. Label positioning is handled by the map control's layering and does not affect geocoding results. Thus, the boundary inaccuracy would exist even if labels were hidden or perfectly placed.
- ✓
Bing Maps geocoding inaccuracies.
Why this is correct
Power BI map visuals delegate geocoding and boundary rendering to Bing Maps. When a report sends region names (e.g., states, provinces) to Bing, the service returns spatial coordinates and boundary polygon geometry; any inaccuracy, stale geo-dataset, or geopolitical ambiguity in that returned geometry directly produces the incorrect boundaries shown. Because the boundaries come from Bing's cartographic data rather than from Power BI or your data source, geocoding inaccuracies are the definitive root cause.
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